<!-- eslint-disable vue/multi-word-component-names -->
<template>
  <div class="score-case">
    <div class="table">
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>科目</th>
            <th>成绩</th>
            <th>考试时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="list.length">
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.subject }}</td>
            <td :class="{ red: !(item.score > 60) }">{{ item.score }}</td>
            <td>{{ formatDate(item.date) }}</td>
            <td><a href="#" @click.prevent="delSubject(item.id)">删除</a></td>
          </tr>
        </tbody>
        <tbody v-else>
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody>
        <tfoot>
          <tr>
            <td colspan="5">
              <span>总分：{{ sum }}</span>
              <span style="margin-left: 50px"
                >平均分(取整):{{ Math.floor(sum / list.length) }}</span
              >
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
    <div class="form">
      <div class="form-item">
        <div class="label">科目：</div>
        <div class="input">
          <input type="text" placeholder="请输入科目" v-model.trim="subject" />
        </div>
      </div>
      <div class="form-item">
        <div class="label">分数：</div>
        <div class="input">
          <input
            type="text"
            placeholder="请输入分数"
            v-model.number.trim="score"
          />
        </div>
      </div>
      <div class="form-item">
        <div class="label"></div>
        <div class="input">
          <button class="submit" @click="addSubject">添加</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
// eslint-disable-next-line no-unused-vars
import moment from "moment";

export default {
  name: "ScoreCase",
  //数据源
  data() {
    return {
      // eslint-disable-next-line no-undef
      list: JSON.parse(localStorage.getItem("list")) || [
        {
          id: 15,
          subject: "语文",
          score: 89,
          date: new Date("2022/06/07 10:00:00"),
        },
        {
          id: 27,
          subject: "数学",
          score: 100,
          date: new Date("2022/06/07 15:00:00"),
        },
        {
          id: 32,
          subject: "英语",
          score: 56,
          date: new Date("2022/06/08 10:00:00"),
        },
        {
          id: 41,
          subject: "物理",
          score: 76,
          date: new Date("2022/06/08 10:00:00"),
        },
      ],
      subject: "",
      score: "",
    };
  },
  // 监听事件源
  methods: {
    formatDate(input) {
      return moment(input).format("YYYY-MM-DD HH:mm:ss");
    },
    delSubject(id) {
      this.list = this.list.filter((item) => item.id !== id);
    },
    addSubject() {
      this.list = [
        ...this.list,
        {
          id: Math.floor(Math.random() * (9999 - 4) + 4),
          subject: this.subject,
          score: this.score,
          date: new Date(),
        },
      ];
      this.subject = "";
      this.score = "";
    },
  },
  //计算属性,必须以函数的形式在computed中。
  //除data和生命周期是函数外，其他都是对象。
  //函数的返回值就是这个属性值，函数不能被调用，只能当作属性用
  computed: {
    sum() {
      return this.list.reduce((prey, item) => prey + item.score, 0);
    },
  },
  watch: {
    list: {
      deep: true,
      handler(newVal) {
        localStorage.setItem('list', JSON.stringify(newVal));
      },
    },
  },
};
</script>

<style lang="less">
.score-case {
  width: 1000px;
  margin: 50px auto;
  display: flex;
  .table {
    flex: 4;
    table {
      width: 100%;
      border-spacing: 0;
      border-top: 1px solid #ccc;
      border-left: 1px solid #ccc;
      th {
        background: #f5f5f5;
      }
      tr:hover td {
        background: #f5f5f5;
      }
      td,
      th {
        border-bottom: 1px solid #ccc;
        border-right: 1px solid #ccc;
        text-align: center;
        padding: 10px;
        &.red {
          color: red;
        }
      }
    }
    .none {
      height: 100px;
      line-height: 100px;
      color: #999;
    }
  }
  .form {
    flex: 1;
    padding: 20px;
    .form-item {
      display: flex;
      margin-bottom: 20px;
      align-items: center;
    }
    .form-item .label {
      width: 60px;
      text-align: right;
      font-size: 14px;
    }
    .form-item .input {
      flex: 1;
    }
    .form-item input,
    .form-item select {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      width: 200px;
      height: 40px;
      box-sizing: border-box;
      padding: 10px;
      color: #666;
    }
    .form-item input::placeholder {
      color: #666;
    }
    .form-item .cancel,
    .form-item .submit {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      border-radius: 4px;
      padding: 4px 10px;
      margin-right: 10px;
      font-size: 12px;
      background: #ccc;
    }
    .form-item .submit {
      border-color: #069;
      background: #069;
      color: #fff;
    }
  }
}
</style>
